[n] failure to reach a minimum required performance; "his failing the course led to his disqualification"
[n] a flaw or weak point; "he was quick to point out his wife's failings"
[adj] going from better to worse
[adj] below acceptable in performance; "received failing grades"
[adj] unable to meet financial obligations; "a failing business venture"
abortive, arrested, bad habit, besetting sin, blemish, blind spot, bootless, bug, cachectic, callow, catch, comedown, coming apart, crack, cracking, crumbling, debasement, debilitated, decadence, decadency, decadent, declension, declination, decline, decl